Coherent free-space optical communications: opportunities and challenges

FP Guiomar, MA Fernandes, JL Nascimento… - Journal of Lightwave …, 2022 - opg.optica.org
The ever-increasing data rate demand for wireless systems is pushing the physical limits of
standalone radio-frequency communications, thus fostering the blooming of novel high …

A photonic integrated circuit–based erbium-doped amplifier

Y Liu, Z Qiu, X Ji, A Lukashchuk, J He… - Science, 2022 - science.org
Erbium-doped fiber amplifiers revolutionized long-haul optical communications and laser
technology. Erbium ions could provide a basis for efficient optical amplification in photonic …

IQ signal demodulation for noncontact vital sign monitoring using a CW Doppler radar: A review

FK Wang, JX Zhong, JY Shih - IEEE Journal of …, 2022 - ieeexplore.ieee.org
Using a Doppler radar for noncontact detection is a promising way to monitor vital signs of a
subject more conveniently than other common contact medical devices, but has many …

Digital signal processing for coherent transceivers employing multilevel formats

MS Faruk, SJ Savory - Journal of Lightwave Technology, 2017 - ieeexplore.ieee.org
Digital coherent transceivers have revolutionized optical fiber communications due to their
superior performance offered compared to intensity modulation and direct detection based …

Digital coherent optical receivers: Algorithms and subsystems

SJ Savory - IEEE Journal of selected topics in quantum …, 2010 - ieeexplore.ieee.org
Digital coherent receivers have caused a revolution in the design of optical transmission
systems, due to the subsystems and algorithms embedded within such a receiver. After …

High-order coherent communications using mode-locked dark-pulse Kerr combs from microresonators

A Fülöp, M Mazur, A Lorences-Riesgo… - Nature …, 2018 - nature.com
Microresonator frequency combs harness the nonlinear Kerr effect in an integrated optical
cavity to generate a multitude of phase-locked frequency lines. The line spacing can reach …

Nonlinear digital pre-distortion of transmitter components

PW Berenguer, M Nölle, L Molle… - Journal of lightwave …, 2015 - ieeexplore.ieee.org
We present a linear and nonlinear digital pre-distortion (DPD) tailored to the components of
an optical transmitter. The DPD concept uses nonlinear models of the transmitter devices …

Spectrally shaped DP-16QAM super-channel transmission with multi-channel digital back-propagation

R Maher, T Xu, L Galdino, M Sato, A Alvarado, K Shi… - Scientific reports, 2015 - nature.com
The achievable transmission capacity of conventional optical fibre communication systems
is limited by nonlinear distortions due to the Kerr effect and the difficulty in modulating the …

Tbit/s multi-dimensional multiplexing THz-over-fiber for 6G wireless communication

H Zhang, L Zhang, S Wang, Z Lu… - Journal of Lightwave …, 2021 - ieeexplore.ieee.org
Photonics-aided terahertz (THz) wireless systems have been progressively developed to
accommodate the forthcoming wireless communication with extremely high data rates in …

Compensation for in-phase/quadrature imbalance in coherent-receiver front end for optical quadrature amplitude modulation

MS Faruk, K Kikuchi - IEEE Photonics Journal, 2013 - ieeexplore.ieee.org
We propose a novel method of compensation for imbalance between in-phase (I) and
quadrature (Q) channels in the front-end circuit of digital coherent optical receivers. Adaptive …